Here you can find the master thesis of David Antos, documenting the principles and design of PATLIB and OPATGEN, user documentation of OPATGEN, and screen versions of the source files. All the sources and pretty-printed documents are in the thesis directory and you can easily fetch them there.
For reading on screen I recommend a special interactive screen PDF version. This version does not contain the user guide, the interactive version of the guide is available separately.
The thesis and the documentation were created using (pdf)eTeX using ConTeXt macro package. The paper and screen version have the only source, they differ in presentation style settings only. To build the files from sources you need the ConTeXt macro package, for the thesis itself you need also Taco Hoekwater's bibliography module. On the CD you can find all the tools in a separate directory.